Alpine HeadUnit Test (HELP!!!) please

[kells]

also have u tried to connect the yellow and red wires up differently, the ones at the back of the HU with the bullet connectors?

[jaybee]

yeah, I have the red going to yellow and vice versa... the power is getting to the unit... it just seems as if the switching power isn't working, when I took it out after i first got the car to see if there was a line-in in it to connect my ipod the red cable into the yellow double bullet slipped out and it did the same thing... The battery power was there, and when you unplugged it and plugged it back in the cd mech whirred but the unit would not power up...

Now it is all connected and it won't power up....

The fuse by the battery, is that just for the radio, as everything else is working.....

[kells]

yeah i have a fuse by the battery just for the stereo but i do have a amp and that cable runs to it..

so do both stereos not work at all in the car now then

[jaybee]

Nope...

No response at all from the alpine, the faceplate is stuck in the half open position and just the cd mechanism whirring on the sony... which is why I am confused...

I'll try wiring it straight to the battery tomorrow and see if that helps sort out where the problem lies

[jaybee]

Okay so...


Tried one (alpine) up against the battery and the faceplate mechanism worked okay, but no life from the front panel, on closer inspection the little flat plastic(very thin) electronic connection between the main unit and the faceplate is split so I think maybe the unit is f?@$ked, however in the absence of a dvm it's a tool! Connected it up inside and no response from the faceplate mechanism.

The sony hu will eject and load cd's but will not power up, so would I be right to say that the switched power is failing to get to it...?

Which is the one in pin L (yellow at connector/red into sony hu)....

[Heyho]

May I suggest that you invest in one of these?

http://cgi.ebay.co.uk/6-12-VOLT-CIRCUIT-TESTER-TEST-LAMP-WITH-SNAP-ON-CLIP_W0QQitemZ120170609493QQihZ002QQcategoryZ30921QQtcZphotoQQcmdZViewItem?refid=store

It really simplifies things, and removes all of the guesswork.

[jaybee]

Sounds like a plan, do you need to have the stereo hooked up, or do you need to take it out of the circuit....

[Heyho]

It doesn't matter - easier with the stereo out, it will at least tell you if you have power where you need it.

Earth the clamp to the chassis, then just touch the tip of the probe on the bare wire you want to test.  Then attach the clamp to live, and test your earth wire.  Start with the basics.

[jaybee]

Thanks for that, dvm en route....

[Heyho]

Be a little careful using a multi-meter, as they will indicate a voltage present, but they will apply no load at all to the feed you are testing.  It's often more reliable to use a light, as even a 10w bulb will load the circuit a little, and will be easier to use.